A new lignan glycoside from Juniperus rigida.

Area of Science:

• Phytochemistry
• Natural Products Chemistry
• Pharmacology

Background:

• Juniperus rigida is a plant species with potential medicinal properties.
• Natural products are a rich source of bioactive compounds.
• Lignans and diterpenes are classes of natural products known for diverse biological activities.

Purpose of the Study:

• To isolate and identify chemical constituents from Juniperus rigida stems and leaves.
• To evaluate the cytotoxic activity of isolated compounds against human tumor cell lines.
• To discover new bioactive compounds from this plant species.

Main Methods:

• Extraction of plant material using methanol and subsequent fractionation.
• Isolation of compounds using chromatographic techniques.
• Structure elucidation using 1D- and 2D-NMR spectroscopy, CD analysis, and comparison with literature data.
• Cytotoxicity assessment using the Sulforhodamin B bioassay.

Main Results:

• A new lignan glycoside, juniperigiside (1), was isolated and characterized.
• Five known lignans (2-6) and five known labdane diterpenes (7-11) were identified.
• Compounds 5 and 6 were reported for the first time in the Juniperus genus.
• Compounds 3 (desoxypodophyllotoxin), 4 (savinin), 7 (trans-communic acid), and 8 (13-epi-torulosal) exhibited considerable cytotoxicity against tested cancer cell lines.

Conclusions:

• Juniperus rigida is a source of diverse lignans and diterpenes, including novel compounds.
• Several isolated lignans and diterpenes possess significant in vitro cytotoxic activity against human tumor cells.
• The findings support further investigation of these compounds for potential anticancer drug development.